Softening hard water Practice exercise 4

A student wants to soften hard borehole water containing both calcium bicarbonate and magnesium sulphate. Which method will remove both types of hardness effectively?

A student wants to soften hard borehole water containing both calcium bicarbonate and magnesium sulphate. Which method will remove both types of hardness effectively?  (1 mark)

A student wants to soften hard borehole water containing both calcium bicarbonate and magnesium sulphate. Which method will remove both types of hardness effectively?  (1 mark)

In the distillation setup above, what is the main function of the condenser?

In the distillation setup below, what is the main function of the condenser?  (1 mark)

In the distillation setup below, what is the main function of the condenser?  (1 mark)

Refer to the diagram of the distillation setup. At which stage is the softened water collected?

Refer to the diagram of the distillation setup below. At which stage is the softened water collected?  (1 mark)

Refer to the diagram of the distillation setup below. At which stage is the softened water collected?  (1 mark)

Refer to the diagram of the distillation setup below. At which stage is the softened water collected?  (1 mark)

Sodium carbonate was added to a beaker of hard water and stirred. After heating the mixture gently, a white solid formed. What is the identity and significance of the solid?

Sodium carbonate was added to a beaker of hard water and stirred. After heating the mixture gently, a white solid formed. What is the identity and significance of the solid?  (1 mark)

Sodium carbonate was added to a beaker of hard water and stirred. After heating the mixture gently, a white solid formed. What is the identity and significance of the solid?  (1 mark)

Two beakers, A and B, each contain 200 ml of water. Beaker A contains water from Lake Victoria, and Beaker B contains distilled water collected after softening hard water by distillation. Soap flakes are added to each and the mixtures are stirred vigorously.Which beaker is most likely to form more lather?

Two beakers, A and B, each contain 200 ml of water. Beaker A contains water from Lake Victoria, and Beaker B contains distilled water collected after softening hard water by distillation. Soap flakes are added to each and the mixtures are stirred vigorously. Which beaker is most likely to form more lather?  (1 mark)

Two beakers, A and B, each contain 200 ml of water. Beaker A contains water from Lake Victoria, and Beaker B contains distilled water collected after softening hard water by distillation. Soap flakes are added to each and the mixtures are stirred vigorously. Which beaker is most likely to form more lather?  (1 mark)

A student conducted a soap test on two water samples. Sample A produced a lot of lather while Sample B formed scum and little lather.Which sample is most likely the softened water?

A student conducted a soap test on two water samples. Sample A produced a lot of lather while Sample B formed scum and little lather. Which sample is most likely the softened water?  (1 mark)

A student conducted a soap test on two water samples. Sample A produced a lot of lather while Sample B formed scum and little lather. Which sample is most likely the softened water?  (1 mark)

After distillation, a student tested the softened water by adding soap flakes and shaking. The water lathered quickly.What is the most likely reason?

After distillation, a student tested the softened water by adding soap flakes and shaking. The water lathered quickly. What is the most likely reason?  (1 mark)

After distillation, a student tested the softened water by adding soap flakes and shaking. The water lathered quickly. What is the most likely reason?  (1 mark)

During a science experiment, a group added a teaspoon of sodium carbonate (washing soda) to hard water. After heating, they noticed a white solid settling at the bottom.Why did this happen?

During a science experiment, a group added a teaspoon of sodium carbonate (washing soda) to hard water. After heating, they noticed a white solid settling at the bottom. Why did this happen?  (1 mark)

During a science experiment, a group added a teaspoon of sodium carbonate (washing soda) to hard water. After heating, they noticed a white solid settling at the bottom. Why did this happen?  (1 mark)

Mary wants to remove temporary hardness from rainwater collected in a tank. Which method would be the most effective and affordable for her?

Mary wants to remove temporary hardness from rainwater collected in a tank. Which method would be the most effective and affordable for her?  (1 mark)

Mary wants to remove temporary hardness from rainwater collected in a tank. Which method would be the most effective and affordable for her?  (1 mark)

A student boiled hard water in a sufuria until half of it evaporated. After cooling, they noticed a white solid at the bottom and sides of the sufuria.What does this solid represent?

A student boiled hard water in a sufuria until half of it evaporated. After cooling, they noticed a white solid at the bottom and sides of the sufuria. What does this solid represent?  (1 mark)

A student boiled hard water in a sufuria until half of it evaporated. After cooling, they noticed a white solid at the bottom and sides of the sufuria. What does this solid represent?  (1 mark)